linux-kernel - Re: [patch 2/2] slab: always consider arch mandated alignment

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Date:	Wed, 26 Jul 2006 20:06:41 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Pekka J Enberg <penberg@...Helsinki.FI>
CC:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Christoph Lameter <clameter@....com>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [patch 2/2] slab: always consider arch mandated alignment

Pekka J Enberg wrote:

>On Wed, 26 Jul 2006, Heiko Carstens wrote:
>  
>
>>We only specify ARCH_KMALLOC_MINALIGN, since that aligns only the kmalloc
>>caches, but it doesn't disable debugging on other caches that are created
>>via kmem_cache_create() where an alignment of e.g. 0 is specified.
>>
>>The point of the first patch is: why should the slab cache be allowed to chose
>>an aligment that is less than what the caller specified? This does very likely
>>break things.
>>    
>>
>
>Ah, yes, you are absolutely right. We need to respect caller mandated 
>alignment too. How about this?
>
>  
>
Good catch - I obviously never tested the code for an HWCACHE_ALIGN cache...


>			Pekka
>
>[PATCH] slab: respect architecture and caller mandated alignment
>
>Ensure cache alignment is always at minimum what the architecture or 
>caller mandates even if slab debugging is enabled.
>
>Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
>  
>
Signed-off-by: Manfred Spraul <manfred@...orfullife.com>

--
    Manfred
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